The SW pins of the LT8646S are High-Z when the part is disabled (EN pin low).
LT8646S
Recommended for New Designs
The LT8645S/LT8646S synchronous step-down regulator features second generation Silent Switcher architecture designed to minimize EMI emissions while delivering...
Datasheet
LT8646S on Analog.com
The SW pins of the LT8646S are High-Z when the part is disabled (EN pin low).